package com.gjson.androidtools.library.imagepicker.util;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.net.Uri;
import android.provider.MediaStore;
import java.io.File;
import java.io.IOException;

/**
 * Bitmap工具类，主要是解决拍照旋转的适配
 * Created by gjson on 2018/6/22.
 */

public class BitmapUtil {

  private BitmapUtil() {
    throw new UnsupportedOperationException("u can't instantiate me...");
  }

  /**
   * 获取图片的旋转角度
   *
   * @param path 图片绝对路径
   * @return 图片的旋转角度
   */
  public static int getBitmapDegree(String path) {
    int degree = 0;
    try {
      // 从指定路径下读取图片，并获取其EXIF信息
      ExifInterface exifInterface = new ExifInterface(path);
      // 获取图片的旋转信息
      int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION,
          ExifInterface.ORIENTATION_NORMAL);
      switch (orientation) {
        case ExifInterface.ORIENTATION_ROTATE_90:
          degree = 90;
          break;
        case ExifInterface.ORIENTATION_ROTATE_180:
          degree = 180;
          break;
        case ExifInterface.ORIENTATION_ROTATE_270:
          degree = 270;
          break;
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
    return degree;
  }

  /**
   * 将图片按照指定的角度进行旋转
   *
   * @param bitmap 需要旋转的图片
   * @param degree 指定的旋转角度
   * @return 旋转后的图片
   */
  public static Bitmap rotateBitmapByDegree(Bitmap bitmap, int degree) {
    // 根据旋转角度，生成旋转矩阵
    Matrix matrix = new Matrix();
    matrix.postRotate(degree);
    // 将原始图片按照旋转矩阵进行旋转，并得到新的图片
    Bitmap newBitmap =
        Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
    if (!bitmap.isRecycled()) {
      bitmap.recycle();
    }
    return newBitmap;
  }

  /**
   * 获取我们需要的整理过旋转角度的Uri
   *
   * @param activity 上下文环境
   * @param path 路径
   * @return 正常的Uri
   */
  public static Uri getRotatedUri(Activity activity, String path) {
    int degree = BitmapUtil.getBitmapDegree(path);
    if (degree != 0) {
      Bitmap bitmap = BitmapFactory.decodeFile(path);
      Bitmap newBitmap = BitmapUtil.rotateBitmapByDegree(bitmap, degree);
      return Uri.parse(
          MediaStore.Images.Media.insertImage(activity.getContentResolver(), newBitmap, null,
              null));
    } else {
      return Uri.fromFile(new File(path));
    }
  }

  /**
   * 将图片按照指定的角度进行旋转
   *
   * @param path 需要旋转的图片的路径
   * @param degree 指定的旋转角度
   * @return 旋转后的图片
   */
  public static Bitmap rotateBitmapByDegree(String path, int degree) {
    Bitmap bitmap = BitmapFactory.decodeFile(path);
    return rotateBitmapByDegree(bitmap, degree);
  }
}
